<template>
<button class="mk-follow-button"
	:class="{ wait: wait, active: u.isFollowing || u.hasPendingFollowRequestFromYou }"
	@click="onClick"
	:disabled="wait"
>
	<template v-if="!wait">
		<template v-if="u.hasPendingFollowRequestFromYou && u.isLocked"><fa icon="hourglass-half"/> %i18n:@request-pending%</template>
		<template v-else-if="u.hasPendingFollowRequestFromYou && !u.isLocked"><fa icon="hourglass-start"/> %i18n:@follow-processing%</template>
		<template v-else-if="u.isFollowing"><fa icon="minus"/> %i18n:@following%</template>
		<template v-else-if="!u.isFollowing && u.isLocked"><fa icon="plus"/> %i18n:@follow-request%</template>
		<template v-else-if="!u.isFollowing && !u.isLocked"><fa icon="plus"/> %i18n:@follow%</template>
	</template>
	<template v-else><fa icon="spinner .pulse" fixed-width/></template>
</button>
</template>

<script lang="ts">
import Vue from 'vue';

export default Vue.extend({
	props: {
		user: {
			type: Object,
			required: true
		}
	},

	data() {
		return {
			u: this.user,
			wait: false,
			connection: null
		};
	},

	mounted() {
		this.connection = (this as any).os.stream.useSharedConnection('main');

		this.connection.on('follow', this.onFollowChange);
		this.connection.on('unfollow', this.onFollowChange);
	},

	beforeDestroy() {
		this.connection.dispose();
	},

	methods: {
		onFollowChange(user) {
			if (user.id == this.u.id) {
				this.u.isFollowing = user.isFollowing;
				this.u.hasPendingFollowRequestFromYou = user.hasPendingFollowRequestFromYou;
				this.$forceUpdate();
			}
		},

		async onClick() {
			this.wait = true;

			try {
				if (this.u.isFollowing) {
					this.u = await (this as any).api('following/delete', {
						userId: this.u.id
					});
				} else {
					if (this.u.hasPendingFollowRequestFromYou) {
						this.u = await (this as any).api('following/requests/cancel', {
							userId: this.u.id
						});
					} else if (this.u.isLocked) {
						this.u = await (this as any).api('following/create', {
							userId: this.u.id
						});
					} else {
						this.u = await (this as any).api('following/create', {
							userId: this.user.id
						});
					}
				}
			} catch (e) {
				console.error(e);
			} finally {
				this.wait = false;
			}
		}
	}
});
</script>

<style lang="stylus" scoped>
.mk-follow-button
	display block
	user-select none
	cursor pointer
	padding 0 16px
	margin 0
	min-width 100px
	line-height 36px
	font-size 14px
	font-weight bold
	color var(--primary)
	background transparent
	outline none
	border solid 1px var(--primary)
	border-radius 36px

	&:hover
		background var(--primaryAlpha01)

	&:active
		background var(--primaryAlpha02)

	&.active
		color var(--primaryForeground)
		background var(--primary)

		&:hover
			background var(--primaryLighten10)
			border-color var(--primaryLighten10)

		&:active
			background var(--primaryDarken10)
			border-color var(--primaryDarken10)

	&.wait
		cursor wait !important
		opacity 0.7

	*
		pointer-events none

</style>
